ignore (someone) at (one's) peril

Translations
игнорировать (кого-то) на свой страх и риск
You can ignore the doctor's advice at your peril.
Вы можете игнорировать советы врача на свой страх и риск.
Definitions
This phrase means that failing to pay attention to or take someone seriously could lead to negative consequences or danger for oneself. It is a warning that disregarding the person may result in harm or risk.